Q: Checking whether the magsafe power adapter is genuine or not

Hi ! I have purchased some 60 W MagSafe 2 Power Adapter MD565CH/A,  85 W MagSafe 2 Power Adapter MD506CH/A & 45 W MagSafe 2 Power Adapter MD592CH/A but the serial number in each category is same e.g. there are 10 units for 60 W & all are having the same serial number. I have a doubt whether these are genuine form Apple or not. Kindly help.